<!DOCTYPE html>
<html lang="en">

<head>
<meta charset="UTF-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>demo</title>
</head>


<body>


</div>
</body>
<script type="text/javascript">
for (let codePoint of 'foo') {
  console.log(codePoint)
}

if('中' === '\u4e2d')
{
  console.log('中文字符');
}
// "f"
// "o"
// "o"
</script>

</html>